Ruby and Sapphire from the Tan Huong-Truc Lau Area, Yen Bai Province, Northern Vietnam
Nguyen Ngoc Khoi, Chakkaphan Sutthirat, Duong Anh Tuan, Nguyen Van Nam, Nguyen Thi Minh Thuyet, and Nguy Tuyet Nhung
Infrared Spectroscopy of Natural vs. Synthetic Amethyst: An Update
Stefanos Karampelas, Emmanuel Fritsch, Triantafillia Zorba, and Konstantinos M. Paraskevopoulos
Exploring the Origin and Nature of Luminescent Regions in CVD Synthetic Diamond
Bert Willems, Alexandre Tallaire, and Julien Barjon
Identification of Extraterrestrial Peridot by Trace Elements
Andy H. Shen, John I. Koivula, and James E. Shigley
A History of Diamonds through Philately: The Frank Friedman Collection
Stuart D. Overlin
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